Some snapshot GUI context menus do not display explanatory text in the Status Bar

[Mark Cranness]

Some snapshot GUI right-click context menus do not display explanatory text in the Status Bar for the items in the menu (at least on Windows hosts - not tested on other hosts).

To reproduce:

• Select 'Current State' on a VM that has a snapshot
• Right-click to get context menu
• Mouse over 'Take Snapshot' and observe that explanatory text appears in the Status Bar
• Mouse over 'Revert to Current Snapshot' and observe that no explanatory text is displayed (it stays at what it was from before)

After a quick, nooby look at the source code, I think this may be a problem with the Qt UI Framework: The context menu actions with the problem are grouped using a QActionGroup object, where the actions that are OK are not. (VBoxSnapshotsWgt.cpp/VBoxSnapshotsWgt::VBoxSnapshotsWgt).